◆to catch sb with their trousers down<英>to catch sb with their pants down使某人突陷窘境;使某人猝不及防
I think we caught them with their pants down. They're a bit confused.我觉得我们让他们下不了台了。他们有点不知所措。
It makes soldiers happy to know that somebody right at the top has been caught with his trousers down.顶头上司出了洋相, 手下士兵都会幸灾乐祸。